JPH0636020A - Image pickup monitoring device - Google Patents

Abstract

PURPOSE:To provide the image pickup monitoring device which is simple and improved in operability and reliability by eliminating the need for a camera visual field moving device for widening the visual field of a camera. CONSTITUTION:The output of a camera 1 on which a fish-eye lens or wide-angle lens is mounted, is separated by a signal separating circuit 2 into a video signal and a horizontal and a vertical synchronizing signal, and the video signal is written in a RAM 4 by using the synchronizing signals and the outputs of counters 6 and 7 driven by a clock generating circuit 5 as a write address of the RAM 4. The written image pickup screen is divided and the divided screens are outputted after image processing, so the video signal written by an address processing circuit 8 is read out by address conversion, and the output video signal is monitored and outputted to obtain easy operability and eliminate the need for the camera visual field moving device. The symmetry of the image pickup screen is utilized to the image pickup monitoring device which can reduce the number of address converting circuits required for the address processing circuit 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surveillance camera system using a surveillance camera and an image pickup display device, which image-processes a desired image at an arbitrary position on the image pickup screen and displays it on the image pickup display screen. It is about.

[0002]

2. Description of the Related Art Recently, using a surveillance camera and a monitor,
Imaging monitoring devices are widely used in commercial fields, financial institutions, etc. for the purpose of crime prevention and the like.

An image sensing and monitoring apparatus using a conventional surveillance camera and monitor will be described below. FIG. 7 shows a block connection diagram of a conventional imaging surveillance device using a surveillance camera and a monitor. In FIG. 7, reference numeral 30 denotes a camera visual field moving device for mechanically changing the camera visual field direction,
Reference numeral 31 is a surveillance camera, and 32 is a video signal display monitor from the camera.

The operation of the image-capturing / monitoring apparatus configured as described above will be described below. When displaying a desired image in the center of the screen in the video imaged by the surveillance camera 31, it can be realized by mechanically operating the camera visual field moving device 30.

[0005]

However, in the above-mentioned structure, the field of view of the camera is narrow, and the adjustment is troublesome because the machine is operated, and the camera field of view moving device is required.
There was a problem that the device scale increased. The present invention is to solve the above-mentioned conventional problems by using a wide-angle lens or a fish-eye lens to expand the field of view and store a video signal, a memory that is a write address of the memory, and a read address of the memory. By using an image processing circuit consisting of a conversion circuit, mechanical adjustment and camera field-of-view moving device are unnecessary, distortion in the peripheral part is eliminated, and the output screen is divided into point symmetry, which becomes the input of the address conversion circuit. An object of the present invention is to provide an imaging monitoring device capable of reducing the number of address conversion circuits corresponding to each divided screen by using a counter and a subtraction circuit for subtracting the ROM output from the maximum pixel address.

[0006]

In order to achieve this object, an image capturing and monitoring apparatus includes a surveillance camera unit having a wide-angle lens or a fisheye lens, a memory for storing a video signal from the surveillance camera unit, and a memory in the memory. A video signal display unit for displaying a video signal stored in the memory, and a signal processing unit for controlling a write or read address and a write or read speed when writing or reading data to or from the memory, The signal processing unit is an imaging and monitoring device characterized by including an address conversion unit that associates an actual image with an image output from the monitoring camera unit.

Further, the signal processing unit divides the video output screen into a screen that is point-symmetric with respect to the center of the image pickup screen and a central screen, so that the input address conversion circuit of the video signal storage memory is centered in the divided screen. One for the screen,
Imaging using one counter for each point-symmetrical screen set, a counter serving as an input address of the address conversion circuit, a subtraction circuit for subtracting the ROM output from the maximum address, and a switch for selecting a split screen It is a monitoring device.

Further, an image of a video output screen obtained by picking up a rectangular diagram composed of a square grid of n rows and m columns (n and m are natural numbers) with the camera equipped with a fisheye lens or a wide-angle lens, and an original image. The respective grids are associated with each other to determine the corresponding addresses of the pixels on both screens, and the created address conversion table for each pixel is used to store the video signal of the camera having a fish-eye lens or a wide-angle lens. The imaging monitoring device converts the read address of the memory and outputs the converted address.

[0009]

With the above structure, the present invention uses a memory for storing a camera output video signal having a wide-angle lens or a fish-eye lens, a counter that is a write address of the memory, and an address conversion circuit that is a read address. No need for mechanical adjustment and camera field-of-view moving device, the video output screen is divided symmetrically with respect to the center point of the screen, and the counter and subtraction circuit that are the inputs of the address conversion circuit are used. As a result, the number of address conversion circuits can be reduced.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In addition, as a present Example, the structure in case a screen is divided into 7 is demonstrated. FIG. 2 shows an example of a screen 7 division method. In FIG. 2, a split screen 12 indicated by a thick line is a split screen in the central portion of the video output screen, and split screens 13 to 16 indicated by dotted lines each include one vertex of the video output screen, and the split screen is point-symmetric with respect to the screen center. The split screens 17 and 18 indicated by thin lines are upper and lower split screens that are point-symmetric with respect to the center of the screen. FIG. 1 is a block connection diagram of an image pickup monitoring apparatus according to an embodiment of the present invention. In FIG.
1 is a surveillance camera equipped with a fisheye lens, 2 is a signal separation circuit for horizontal and vertical sync signals and video signals, 3 is an A / D converter, 4 is a random access memory (hereinafter abbreviated as RAM) for storing the video signals output from the camera 5 is a clock generation circuit having a sampling frequency of the video signal, 6 is R
An AM write horizontal addressing counter, 7 a write vertical addressing counter, 8 a RAM read address, an address processing circuit for address conversion processing for distortion correction for each divided screen of a video output screen, and 9 RAM output A signal D / A converter, 10 is a switch for switching between camera output and D / A converter output, and 11 is a monitor for displaying a camera output screen or a split screen.

The operation of the image-capturing / monitoring apparatus configured as described above will be described. The image-capturing signal of the surveillance camera 1 is separated into a horizontal / vertical synchronizing signal and a video signal by the signal separating circuit 2.
Each of the counters 6 and 7 has the scan start address of the output screen set therein. The operation of the counter 6 for specifying the horizontal address will be described below. The scanning start address is set by the horizontal synchronizing signal, and the counter 6 starts. The counter 6 uses the output of the clock generation circuit 5 as a clock signal and controls writing from the start point to the horizontal scanning end. Then, the counter 6 stops after counting a fixed number determined by the number of horizontal pixels, is reset by the horizontal synchronizing signal, and restarts.

Next, the counter 7 for determining the vertical address
The scanning start address is determined by the vertical synchronizing signal, and the counter 7 starts. The counter 7 uses the horizontal synchronizing signal as a clock signal and controls writing from the starting point to the vertical scanning end. Counter 7
When a certain number of scanning lines determined by the number of vertical pixels is counted, the operation is stopped, and the operation is cleared by the vertical synchronization signal and restarted. The outputs of the counters 6 and 7 determine the write horizontal and vertical addresses of the RAM 4. After the address valid time is delayed by the write enable signal, the video signal output from the A / D converter 3 is written in the RAM 4 at the timing of the output clock of the clock generation circuit 5. The video signal is written in the RAM 4 as described above. Next, the operation of the address processing circuit 8 will be described.

FIG. 3A shows a board-shaped figure obtained by dividing a rectangular figure into n with a square lattice. In addition, the address of each lattice is assigned as shown in the figure. An output screen obtained by imaging this figure with a fisheye lens is as shown in FIG. That is,
If the image is read from the RAM 4 storing the image pickup screen as it is and displayed, the lattice in the peripheral portion is greatly distorted. In addition, it is reduced in the peripheral portion and enlarged in the central portion.
Therefore, when reading from the RAM 4, the write address must be converted and read. That is, FIG.
If the camera output image of (2) is converted into the image of FIG. 3 (1) and then output, it can be output as the original image with the distortion corrected.
Therefore, an address processing circuit is required.

Next, the address conversion method will be described. FIG. 4 is a view in which (1) and (2) of FIG. 3 are overlapped. The horizontal and vertical addresses of the pixel p in the grid 25 ′ of FIG. 3 (2) are X and Y, and the corresponding grid 25 ′ of FIG. 3 (1) is used.
If the horizontal and vertical addresses of the inner pixel p ′ are X ′ and Y ′, the address conversion of X, Y → X ′, Y ′ is performed on all the pixels, and if the converted addresses are read, the distortion The corrected image can be output.

In this embodiment, the conversion of this address is calculated in advance and stored in the memory to realize this conversion.

That is, the read address is converted using a read only memory (hereinafter abbreviated as ROM) which stores the read address data of the RAM 4 determined in advance.

The operation of the address processing circuit 8 using this ROM will be described below. FIG. 5 is a block connection diagram of the address processing circuit 8. Reference numerals 19 to 22 correspond to the divided screens and are read address conversion ROMs of the RAM 4 for image processing of each divided screen. The ROM 19 stores the read conversion address of the center divided screen 12, the ROM 20 stores the read conversion address of the divided screen 13, the ROM 21 stores the read conversion address of the divided screen 14, and the ROM 22 stores the read conversion address of the divided screen 17. FIG. 6 shows a configuration in which the output screen of the fisheye lens is divided into 60 pixels, but when reading the divided screens 28 and 29 indicated by the dotted lines, the order of the pixels to be read out is p0, p in the divided screen 28.
1, p2 ... p4, p10, p11 ... p14, p2
0 ... p24. On the other hand, when reading the split screen 29, the order of reading pixels is p59, p58, p57,
p56, p55, p49, ... p45, p39, p3
8 ... By setting p35, it is possible to read out pixels that are completely point-symmetrical with respect to the center. Therefore, if one read address conversion ROM is used for the two divided screens 13 and 16 in FIG. good. To achieve this,
The screen 13 is directly output to the ROM, and the screen 16 is output by subtracting the ROM output from the maximum pixel address. Split screens 14, 15 and 17, 18 of FIG.
Is also the same. That is, the image processing circuit for distortion correction can be realized by the ROM and the subtraction circuit.

FIG. 5 is a block connection diagram of the address processing circuit 8. 19 to 22 are the central screen 12 of the output screen of FIG. 2, four split screens 13, 16 and 14, 15 including the respective vertices, and upper and lower split screens 17 and 18 not including the vertices.
Address conversion ROM for image processing, 23 is a horizontal addressing counter, 24 is a vertical addressing counter, 25 is a clock generation circuit, 26 is a subtraction circuit for subtracting and outputting the ROM output from the maximum pixel address, 27
Is a switch for selecting the ROM output or the subtraction circuit output corresponding to each divided screen according to the designated screen input.

The operation will be described below. The counters 23 and 24 operate similarly to the counters 6 and 7 in FIG. The clock speed of the clock generation circuit 25 is divided from the write clock speed according to the screen division ratio.
When the ROM input address is determined, the ROMs 19 to 22
Outputs read address conversion data for performing image processing on each divided screen. The ROM designation method will be described below. Corresponding R when selecting split screen
It is output from the OM 19 as it is, and in the case of selecting the screen 13 in the divided screens 13 and 16, it is output from the corresponding ROM 20 as it is, but in the selection of the screen 16, the subtraction circuit output to the ROM 20 is selected. When the screen 14 is selected in the selection of the divided screens 14 and 15, the same processing is performed on the corresponding ROM 21. When the divided screens 17 and 18 are selected, the same processing is performed on the corresponding ROM 22.

In this way, the read address of the RAM 4 is determined, and after the address valid time is delayed, the image-processed divided screen is output. This output is D / A converted by the D / A converter 9 and output as a monitor.

As described above, the image pickup and monitoring apparatus according to the present embodiment has excellent effects in terms of expanding the field of view of the camera, making mechanical adjustment, eliminating the need for a device for moving the camera field of view, and reducing the required address conversion ROM capacity. To be Further, according to this embodiment, the camera 1 having the fisheye lens and the RAM 4 for storing the video signal, the counters 6 and 7 serving as the write address of the RAM 4 are used, and the address conversion ROM 19 corresponding to the central divided screen of the output screen is used. , The address conversion ROMs 20 and 21 for the four divided screens including the respective vertices and the address conversion ROM 22 for the upper and lower divided screens are used to create an address conversion table, and the address conversion data for each divided screen is stored in each ROM. Using the counters 22 and 23 that are the input addresses of the ROM and the screen selection switch 27, the corresponding ROM 19 output is selected as it is in the divided screen 12 selection, the corresponding ROM 20 output is selected in the screen 13 selection, and the ROM 20 in the screen 16 selection. Select the subtraction circuit output for the output, and then select split screens 14 and 15, screen 1
By selecting similarly according to the selection of 7 and 18, it is possible to expand the camera field of view and perform image processing, which is excellent in terms of mechanical adjustment, elimination of the camera field of view moving device, and reduction of the required ROM capacity. The effect is obtained.

In this embodiment, seven divided screens are used, but the same effect can be obtained with any number of divided screens.

Further, in this embodiment, the address conversion is performed by RA.
Although this is performed when reading data from M4, the address conversion may be performed first and then stored in RAM4.

[0024]

As described above, the present image-capturing / monitoring apparatus includes a camera having a wide-angle lens or a fish-eye lens, a monitor for displaying a captured image, a memory for storing a camera output image signal, and a counter serving as a write address thereof. When,
By dividing the video output screen into a screen that is point-symmetric with respect to the center of the screen and a central screen, and by matching the pixel addresses of the image captured by the fisheye lens or wide-angle lens with the rectangular image divided by the square lattice, the original image An address conversion circuit that creates an address conversion table and performs address conversion according to the table, and one address conversion circuit that serves as a read address of the memory for each divided screen is used for each central screen and each point-symmetrical screen set. However, by having a configuration that includes a subtraction circuit that subtracts the ROM output from the maximum pixel address and a switch that selects each divided screen, the camera field of view is expanded, and mechanical adjustment and a camera field-of-view moving device become unnecessary, It is possible to realize an excellent imaging monitoring device that can reduce the number of address conversion circuits corresponding to each divided screen.

[Brief description of drawings]

FIG. 1 is a block connection diagram of an image pickup monitoring apparatus according to an embodiment of the present invention.

FIG. 2 is a method for dividing an imaged screen according to an embodiment of the present invention.

FIG. 3 (1) Image obtained by dividing a rectangular diagram by a square lattice (2) Image obtained by imaging (1) with a fisheye lens

FIG. 4 is a correspondence diagram of pixels between the images of (1) and (2) in (FIG. 3).

FIG. 5 is a block configuration diagram of an address conversion circuit according to an embodiment of the present invention.

FIG. 6 is a diagram showing a symmetric relationship of each lattice of an image captured by a fisheye lens.

FIG. 7 is a block connection diagram of a conventional imaging monitoring device.

[Explanation of symbols]

 1 Monitoring Camera 2 Signal Separation Circuit 3 A / D Converter 4 RAM 5 Clock Generation Circuit 6 Counter 7 Counter 8 Address Processing Circuit 9 D / A Converter 10 Changeover Switch 11 Monitor

Claims (3)

[Claims] 1. A surveillance camera unit having a wide-angle lens or a fisheye lens, a memory for storing a video signal from the surveillance camera unit, and a video signal display unit for displaying the video signal stored in the memory. When writing or reading data to or from the memory, a signal processing unit for controlling the writing or reading address and the writing or reading speed is provided, and the signal processing unit depends on the actual image and the output of the surveillance camera unit. An image capturing and monitoring apparatus comprising an address conversion unit that associates images. 2. The signal processing unit divides the video output screen into a screen that is point-symmetric with respect to the center of the imaging screen and a center screen, so that the input address conversion circuit of the video signal storage memory is centered in the split screen. One for each screen, one for each pair of point symmetric screens, a counter to be the input address of the address conversion circuit, a subtraction circuit for subtracting the ROM output from the maximum address, and a divided screen are selected. The imaging and monitoring device according to claim 1, further comprising a switch. 3. An image of a video output screen obtained by imaging a rectangular diagram composed of a square grid of n rows and m columns (n and m are natural numbers) with the camera having a fisheye lens or a wide-angle lens,
Corresponding each grid of the original image, thereby determining the corresponding address of each pixel of both screens, using the created address conversion table of each pixel, the video signal of the camera having a fisheye or wide-angle lens The imaging monitoring apparatus according to claim 1, wherein a read address of the memory for storing the information is converted and output.